red-shift

redshift

[red-shift]
noun Astronomy.
a shift toward longer wavelengths of the spectral lines emitted by a celestial object that is caused by the object moving away from the earth.
Also, red shift.


Origin:
1920–25; red1 + shift

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World English Dictionary
redshift (ˈredˌʃɪft)
 
n
Compare: blueshift a shift in the lines of the spectrum of an astronomical object towards a longer wavelength (the red end of an optical spectrum), relative to the wavelength of these lines in the terrestrial spectrum, usually as a result of the Doppler effect caused by the recession of the object

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